with a castle under construction here in the united states. After a long delay, a self-made billionaire and his wife are back to building their personal versailles, the largest single-family home in the country. Abc's matt gutman gives us the royal tour. Reporter: It's a house fit for a queen. Or at least, self-appointed american royalty. The siegels and versailles are back. We're back. We're back. We never left. But we are definitely back. Reporter: After a four-year hiatus, the king and queen of this orlando area palace, jackie siegel and her billionaire husband, david siegel, have resumed construction on the biggest house in america. It could swallow the white house. It's called versailles. You bought a quarry in italy and had it shipped back here. It's cheaper to have it done in china than in italy. Reporter:1 million pieces of marble. They have a big family. Eight kids, five dogs, six if you count the one that's stuffed. It stands to reason they need a big house. But at 90,000 square feet, this 15-bed, 30-bath home can also HOLD 2 747s. The siegels' home was first featured in the documentary "the queen of versailles," the ultimate example of the supersized mansion. This is almost like a riches-to-rags story. When we saw them a year ago, versailles was at a standstill. But the recession over, the couple is building again, existing no expense will be spared. Whatever it takes to finish it, that's what I'll spend. Reporter: Fully committed to it now? Fully committed. Reporter: So committed, he's building a 4,000 square foot ride-in closet. I have a gold elevator closet. Reporter: Sometimes you have to make compromises. For "good morning america," matt gutman, abc news, the versailles mansion, florida.

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